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    SubjectRe: silent semantic changes with reiser4
    On Thu, Aug 26, 2004 at 01:43:59AM -0700, Hans Reiser wrote:
    > >Again, O_DIRECTORY was added to solve a real-world race, not just for
    > >the sake of it.
    > >
    > Can you supply more details and we will try to reply concretely? Thanks.

    It's really userland programming 101 :)

    you need to fstat after open to really check that no one swtiched the
    path below you to a fifo or device, O_DIRECTORY gets that directly in
    the open call, with the additional benefit of making sure you don't
    get any of the sideeffects at all that would happen if you're opening
    a device file.

    the current reiser4 semantics break that and as soon as you're having a
    world-writeable (e.g. /tmp) dir on it and someone is doing an opendir
    on it he's lost.

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